<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title></title>
    <style media="screen">
    .box {
      width:200px; height:200px; background:#CCC; margin:100px auto 0;
    }
    .box:active {transform:scale(2,1) rotate(45deg)}
    </style>
  </head>
  <body>
    <div class="box">aaa</div>
  </body>
</html>
